var async = require('async'); 
//初始化 
var async_lists = [{ aa: 11, bb: 21 }, { aa: 31, bb: 41 }, { aa: 51, bb: 61 }, { aa: 71, bb: 81 }, { aa: 91, bb: 91 }]; 
var task = []; 
task.push(function (callback) { 
 console.log('第一个task任务'); 
 //循环 
 async.eachSeries(async_lists, function (async_list, cb) { 
  task_a(async_list, cb) 
 }, function (err) { 
  if (err) return callback(err); 
  //重新赋值 
  async_lists = [{ aa: 12, bb: 22 }, { aa: 32, bb: 42 }, { aa: 52, bb: 62 }, { aa: 72, bb: 82 }, { aa: 92, bb: 92 }]; 
  callback() 
 }); 
}) 
task.push(function (callback) { 
 console.log('第二个task任务'); 
 async.eachSeries(async_lists, function (async_list, cb) { 
  task_a(async_list, cb) 
 }, function (err) { 
  if (err) return callback(err); 
  async_lists = [{ aa: 13, bb: 23 }, { aa: 33, bb: 43 }, { aa: 53, bb: 63 }, { aa: 73, bb: 83 }, { aa: 93, bb: 93 }]; 
  callback() 
 }); 
}) 
task.push(function (callback) { 
 console.log('第三个task任务'); 
 async.eachSeries(async_lists, function (async_list, cb) { 
  task_a(async_list, cb) 
 }, function (err) { 
  if (err) return callback(err); 
  callback() 
 }); 
}) 
 
//最外层流程控制 
async.waterfall(task, function (err, result) { 
 if (err) return console.log(err); 
 console.log('成功'); 
}) 
 
function task_a(async_list, cb) { 
 var task2 = []; 
 task2.push(function (cb) { 
  console.log('第一次 : ', async_list); 
  setTimeout(function () { 
 
   cb() 
  }, 1000); 
 }) 
 task2.push(function (cb) { 
  console.log('第二次 : ', async_list); 
  console.log('---------------------------'); 
  setTimeout(function () { 
 
   cb() 
  }, 1000); 
 }) 
 //循环内流程控制 
 async.waterfall(task2, function (err, result) { 
  if (err) return cb(err); 
  cb(); 
 }) 
}